She wants to spend her remaining time making memories with her husband and two kids.

Earlier this year, Jessica Herbert discovered she had an inoperable brain tumor and was told she had an estimated 12 to 18 months to live. The diagnosis came after the 30-year-old mother-of-two and her husband Eric, 31, found out they were expecting their third child.

"I'd been having headaches and thought they were just related to the pregnancy," Jessica, from Springville, Utah, told People. "Then in early March, while I was sleeping, I had a seizure and started foaming at the mouth. My husband dialed 911 and I was taken to the hospital where they found a huge mass on the right side of my brain."

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Doctors told her that the four-inch tumor was anaplastic astrocytoma, a rare form of cancer that is inoperable. "It was pretty hard to accept, knowing that I have young children and this terrible prognosis," Herbert said. "Absolutely, there were days — and still are days — when I shut the door and break down, realizing what could happen. Then I process that, wipe the tears away and get going. I don't want my girls to have to worry about this."

Courtesy Jessica Herbert

On July 17, Jessica will be induced to deliver her third daughter, who will join sisters Harlow, 5, and Harper, 3. Jessica's sister-in-law, Lindsey Jones, set up a You Caring account to raise money to send the family on a vacation overseas before Jessica's cancer progresses. As of Friday morning, approximately $19,800 had been donated. The family hopes to visit France, because of daughter Harlow's obsession with Paris.

"I want to be the one to take her there," Jessica said. "I want all of us to go together and take a lot of pictures and videos so that even if my girls don't remember the trip, they'll have a way to experience it again when later on. Quality time — that's where my focus is — I want to create as many memories as I can."

As for how her husband is feeling, Eric told People he is inspired by his wife's courage. "The thought that my best friend and soulmate could be taken from me breaks my heart," he said. "But we will not give up at any point, ever. We are going to fight this thing with all that we have."

Once Jessica delivers the baby, she will undergo chemotherapy and radiation treatment in hopes that the tumor won't continue growing in size.

"It isn't curable, but it's treatable," she said. "So I'm holding on to that. If I can leave anything to my husband and kids, I want it to be that I am happy and positive, with an enthusiasm for life. I have to have faith that things happen in life for a reason."